Purchasing iPhone 5 from Straight Talk or store?

I have been doing some research on the iPhone 5 on Straight Talk. I'm going to be getting the reconditioned one for $500, and my mall is currently selling the used ones. I'm debating on whether or not to order it straight from them or going to the store to buy one and ordering a micro sim from Straight Talk. I heard that ordering it from Straight Talk has disadvantages, like limiting it to only 3G and not 4G LTE (on AT&T's network).Is this true? Either way, I'm going to be using it with Straight Talk on AT&T's network so I will have to order a AT&T micro sim card from them. I have also heard that sometimes they will cap your data, shutting it off if you use too much? I have never experienced this with Straight Talk myself, but have any of you had this problem?

Straight talk

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